CN111128208B - Portable exciter - Google Patents
Portable exciter Download PDFInfo
- Publication number
- CN111128208B CN111128208B CN201811278476.6A CN201811278476A CN111128208B CN 111128208 B CN111128208 B CN 111128208B CN 201811278476 A CN201811278476 A CN 201811278476A CN 111128208 B CN111128208 B CN 111128208B
- Authority
- CN
- China
- Prior art keywords
- noise
- sound
- signal
- frequency
- subharmonic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012545 processing Methods 0.000 claims abstract description 26
- 238000010276 construction Methods 0.000 claims abstract description 20
- 230000009467 reduction Effects 0.000 claims abstract description 14
- 230000000873 masking effect Effects 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 14
- 238000004458 analytical method Methods 0.000 claims description 11
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 7
- 230000006870 function Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 230000005236 sound signal Effects 0.000 description 12
- 230000004927 fusion Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 206010013954 Dysphoria Diseases 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 206010038743 Restlessness Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000008451 emotion Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000001755 vocal effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/003—Changing voice quality, e.g. pitch or formants
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention provides a portable exciter, which aims to solve the problem that the exciter cannot play an optimal role in high-frequency noise in the prior art. Comprises a signal acquisition device, a processing generator and a sound playing device; the signal acquisition device is used for acquiring noise in the acoustic environment; the processing generator is used for acquiring the noise acquired by the signal acquisition device and generating a harmonic signal according to the noise; the sound playing device is used for inputting the subharmonic signals and playing the subharmonic signals which can be fused with noise in the sound environment to form fused harmony noise reduction construction sound. The portable exciter provided by the invention can improve the tone quality, tone color, reduce the sharpness of sound and improve the sound quality of the sound environment by only arranging the portable exciter near the noise source without considering the specific form of the noise source. The portable exciter is easy to implement, simple to operate and not limited by the environment, as long as it is placed in an acoustic environment where noise cancellation is required.
Description
Technical Field
The invention belongs to the field of noise processing, and particularly relates to the field of noise improvement by adopting an exciter.
Background
Noise is a type of sound that causes people to be annoying or that is too loud and harmful to the health of the human body. Noise pollution is mainly caused by traffic transportation, vehicle whistling, industrial noise, building construction, social noise such as concert halls, tweeters, early markets, loud speaking of people and the like.
Noise can be classified into high frequency noise, intermediate frequency noise, low frequency noise, and the like according to the frequency. The existing ANC technology (English is called Active Noise Cancellation, chinese is called active noise elimination or noise reduction) is adopted to process low-frequency noise. The principle is that the sound wave with the same opposite phase and the same amplitude as the noise in the sound environment is generated, and the noise is neutralized, so that the noise reduction effect is realized. )
Previous studies have considered that part of the noise is due to the loss of a few components of the spectrum, mainly the rich harmonics of intermediate and high frequencies, which sound to lack the sensation of presence, lack the penetration, lack the sense of fineness, lack the clarity, and lack the overtones of high frequencies. Therefore, an exciter was invented to complement the high frequency overtones. The exciter restores the lost details from modern electronics and psycho-acoustic principles, reproduces a device again, generates rich and tunable musical harmonics (overtones) via special enhancement lines, and mixes with the direct signal in the output amplification circuit. On the one hand, the function is used for processing the sound and recovering the lost part, such as middle and high frequency overtones like site sense, relativity sense, reality sense and the like. After excitation, the tone color can be increased in definition, intelligibility and transparency, and the noise reduction and complementation are comfortable harmony.
The high frequency noise mainly comes from industrial machines (such as loom, lathe, air compressor, pneumatic pick, blower, etc.), modern vehicles (such as car, train, motorcycle, tractor, airplane, etc.), tweeters, building sites, loud sounds of malls, sports and entertainment sites, etc., current sounds generated in transformers, etc. The high-intensity noise damages the organism of people, causes people to feel tired, produces negative emotion and even causes diseases, and has the characteristics of super penetrability and difficult attenuation, and the high-frequency noise reduction is carried out by using the sound absorption and insulation physical noise reduction technology at present, but the sound pressure level is reduced entirely, and the sound quality cannot be improved.
In the high-frequency noise environment, the exciter mainly increases the high-frequency harmonic component of the sound for the low-frequency sound, and cannot optimize the high-frequency noise.
Disclosure of Invention
The invention provides a portable exciter, which aims to solve the problem that the exciter cannot play an optimal role in high-frequency noise in the prior art.
The portable exciter provided by the invention comprises a signal acquisition device, a processing generator and a sound playing device;
the signal acquisition device is used for acquiring noise in an acoustic environment;
the processing generator is used for acquiring the noise acquired by the signal acquisition device and generating a harmonic signal according to the noise;
the sound playing device is used for inputting the subharmonic signals and playing the subharmonic signals which can be fused with noise in the sound environment to form fused harmony noise reduction construction sound.
The portable exciter provided by the invention collects noise (mainly high-frequency noise) in an acoustic environment through the signal collecting device, generates subharmonic signals of the high-frequency noise according to the high-frequency noise in the acoustic environment, and plays the subharmonic signals through the sound playing device to form fusion and sound (harmony interval) so as to improve the acoustic quality of the environment. The portable exciter provided by the invention can be placed near the noise source without considering the specific form of the noise source as long as the noise source emits high-frequency noise, the subharmonic signal is constructed by utilizing the related knowledge of music acoustics, and the sound signal in the environment is modified based on the psychoacoustic characteristics of people to form fusion and sound so as to optimize the high-frequency noise, so that the tone quality and tone quality can be improved, the sharpness of the sound can be reduced, and the sound quality of the sound environment can be improved. The portable exciter is easy to realize, simple to operate, does not depend on other products as a parent body, is not limited by environment, and can be placed in an acoustic environment where noise elimination is required.
Further, the processing generator comprises an analysis acquisition module and a signal generation module;
the analysis acquisition module is used for acquiring the noise, analyzing the frequency and the sound pressure level of the noise and acquiring the subharmonic composition which needs to be generated;
the signal generation module is used for generating subharmonic signals according to the frequency and the sound pressure level of the noise.
Further, a display is included for displaying parameters and/or processes in the process generator.
Further, a housing is included; the processing generator is a control circuit board; the signal acquisition device is a built-in microphone, and the sound playing device is a built-in loudspeaker; the control circuit board, the built-in microphone and the built-in speaker are installed in the shell. This preferred approach integrates it into one device, which need only be placed in close proximity to the noise source when it is desired to optimize the high frequency noise environment.
Further, the device comprises a shell, wherein the processing generator is a control circuit board; the signal acquisition device is an external microphone, and the sound playing device is an external loudspeaker; the control circuit board is arranged in the shell; the external microphone and the external loudspeaker are connected with the control circuit board in a wired or wireless mode. In the mode, the loudspeaker and the microphone can be arranged outside to be split, the external microphone and the external loudspeaker are arranged near a noise source to sample noise, and subharmonic signals are played through the external loudspeaker after being processed.
Further, an LCD display screen is mounted on the housing.
Further, the control circuit board comprises a central processing unit and a plurality of interface modules.
Further, the device also comprises a memory, wherein each preset subharmonic signal corresponding to the noise frequency is stored in the memory.
Further, the processing generator may call a subharmonic generation function by which the component harmonic signals are generated in real time.
Further, the processing generator further comprises a generator for generating a low frequency construction signal of equal amplitude in anti-phase with the low frequency noise.
Drawings
FIG. 1 is a schematic diagram of a portable subharmonic exciter according to an embodiment of the present invention for noise reduction and cancellation of noise sources;
FIG. 2 is a schematic block diagram of a portable subharmonic exciter provided in an embodiment of the invention;
FIG. 3 is a schematic diagram of a process generator module provided in an embodiment of the present invention;
FIG. 4 is a schematic block diagram of a preferred portable subharmonic exciter provided in an embodiment of the invention;
FIG. 5 is an exploded schematic perspective view of a portable subharmonic exciter provided in an embodiment of the invention;
fig. 6 is an exploded perspective view of another portable subharmonic exciter provided in an embodiment of the invention.
Wherein, 1, a portable exciter; 2. a noise source; 3. fusion and sound; 4. a human ear; 11. a signal acquisition device; 12. a process generator; 13. a sound playing device; 14. a display; 121. an analysis acquisition module; 122. a signal generation module; 10. a housing; 101. a lower case; 102. an upper cover; 11a, built-in microphone; 12a, a control circuit board; 13a, built-in speakers; 14a, LCD display screen; 11b, an external microphone; 13b, external speakers.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The working principle of the invention is described as follows:
in musical acoustics, the principle of vocal music is that the sound (including noise as well) that we hear is composed of two parts, a fundamental wave and a harmonic wave (overtones), and the frequency of the harmonic wave is generally an integer multiple of the frequency of the fundamental wave (for distinction, simply harmonic frequency) component (for distinction period, simply fundamental frequency). The fundamental frequency determines the pitch, the harmonic frequency determines the timbre, which is the "ringing" of this sound, and the timbre determines the "aesthetic" or "harmony" (of course, the result of interactions between them, not so simple single correspondence, here for better understanding). Thus, the creak noise of singers and the squeak noise of metal objects when the metal objects scratch through glass can be explained, and the center frequency is similar, but subjective feeling is different from other reasons, and overtones of the creak noise and the creak noise are different.
If its harmonic components are constructed entirely according to the principle of musical acoustics, subjective feeling may be improved, but the degree of annoyance increases due to the increase of high frequency components, and the purpose of improving the quality of ambient sound cannot be achieved. We then think in the reverse direction that the construction mechanism is still the relevant principle of musical acoustics by adding the subharmonic (subharmonic for short) component of the high frequency signal. The effects of adding the fractional harmonic wave and the harmonic wave in subjective feeling are the same, the sound quality can be improved, the explanation of the two signals in a physical mechanism is the same, namely the probability of superposition of the two signals is the same, for example, the fundamental frequency is 5000Hz, the harmonic frequency is 10000Hz, the harmonic wave is superposed with the fundamental frequency once every two times of vibration, and the frequency ratio of the harmonic frequency to the fundamental frequency is 2:1; the fundamental frequency is 5000Hz, the subharmonic component is 2500Hz, the fundamental frequency coincides with the subharmonic once every two times of vibration, and the frequency ratio of the fundamental frequency to the harmonic frequency is 2:1; both are identical. In psychoacoustics, when we add subharmonics, the ratio occupied by the high frequency component is reduced in the whole frequency domain, and the amount of the high frequency component reflects the magnitude of the dysphoria, so the dysphoria is reduced.
Based on the above principle, as shown in fig. 1, for example, the noise source 2 emits noise including high-frequency noise, low-frequency noise, and the like into the acoustic environment. The low-frequency noise can be processed by adopting an ANC technology, and the ANC technology cannot be effectively processed for high-frequency noise, at the moment, the ANC technology is required to be applied to the portable exciter 1 provided by the invention, the portable exciter 1 provided by the invention can be used for constructing and generating subharmonic signals according to parameters such as frequency, sound pressure level and the like of the high-frequency noise, the subharmonic signals are used for playing, noise reduction construction sound is played, the noise reduction construction sound can be fused with the high-frequency noise emitted by the noise source 2, the frequency spectrum of the noise reduction construction sound is complemented, fusion sum sound 3 is formed, the fusion sum sound 3 enters the human ear 4, and uncomfortable feeling cannot be generated when a listener hears the fusion sum sound 3. The acoustic environment is a system composed of all sounds in a certain area. Noise also belongs to sound, and parameters characterizing the acoustic environment noise also include frequency, sound pressure level, etc. The sound pressure level (sound pressure level) is an index for representing the sound pressure, and the sound pressure is the change generated after the atmospheric pressure is disturbed by sound waves, namely the residual pressure of the atmospheric pressure, which is equivalent to the pressure change caused by the superposition of sound wave disturbance on the atmospheric pressure. The amount of pressure change due to vibration as the sound waves pass through the medium. It is time-varying and the measured sound pressure is its effective value. The unit is pascal (Pa). The sound pressure level is represented by 20 times the usual logarithm of the ratio of the sound pressure P of a certain sound to the basic sound pressure value P0, i.e. 20lg P/P0 Units are decibels (dB).
As shown in fig. 2 below, the portable exciter 1 provided in this example includes a signal acquisition device 11, a processing generator 12, and a sound playing device 13;
the signal acquisition device 11 is used for acquiring noise in an acoustic environment; specifically, the main frequency component that affects the sound quality among the sound components in the sound environment. The noise signal is generally collected near the noise source 2, so that the signal collection device 11 is located on the path of sound propagation, and the closer to the noise source 2, the better the noise signal is, so that energy loss generated in the sound propagation process can be avoided, and the noise signal collected by the signal collection device 11 is stronger. For noise signals in acoustic environments, the main purpose is to directly or indirectly detect frequency and sound pressure level. The method is well used for the analysis acquisition and generation of subsequent subharmonic signals.
The processing generator 12 is configured to acquire noise acquired by the signal acquisition device 11, and generate a harmonic signal according to the noise;
the sound playing device 13 is used for inputting the subharmonic signals and playing the noise which can be fused with the noise in the sound environment to form the fused noise-reducing construction sound of the sound 3.
The sound playing device 13 can be arranged at the noise source 2, so that the same way of homology of the subharmonic signal and the noise signal in the sound environment can be ensured, uncertain factors such as attenuation generated in the propagation process of the subharmonic signal are eliminated, and the noise reduction effect after the subharmonic signal and the high-frequency noise emitted by the noise source 2 are fused is improved.
Further, the processing generator 12 includes an analysis acquisition module 121 and a signal generation module 122;
the analysis acquisition module 121 is configured to acquire the noise, analyze the frequency and the sound pressure level thereof, and acquire the subharmonic component that needs to be generated;
for example: the frequency of the collected high-frequency noise is 5000Hz, the sharpness is high at the moment, the dysphoria of people is easy to cause, octave fraction harmonic, namely 2500Hz subharmonic component is needed to be generated at the moment, and the quality of the environmental sound is improved to the greatest extent; however, when the noise frequency of the motor is 4000Hz, four-degree fractional harmonics, that is, 3000Hz fractional harmonics, are required to be generated, so that the quality of the environmental sound is improved to the greatest extent. (the fully coordinated intervals in music theory include pure one, pure eight, pure five, pure four. The frequency ratio of other intervals: 16:15 less than two degrees, 9:8 less than three degrees, 6:5 less than three degrees, 5:4 greater than three degrees, 4:3 less than four degrees, 45:32 greater than four degrees, 64:45 less than five degrees, 3:2 less than five degrees, 8:5 less than six degrees, 5:3 greater than seven degrees, 16:9 less than seven degrees, 5:27 greater than three degrees.). Meanwhile, the sound pressure level is also analyzed, and the sound pressure level of subharmonic waves to be generated is corresponding.
The signal generating module 122 is configured to generate a subharmonic signal according to the subharmonic component that needs to be generated. The main function of the signal generation module 122 is to generate a target signal determined to be generated by the analysis acquisition module 121: subharmonic signals. The generation of the target signal can be in two forms, one is to store all subharmonic components needed by the high-frequency noise signal, and when the analysis module determines the target signal, the corresponding subharmonic signal is directly called. The method has low cost, but is not fine enough in detail processing of sound construction, so the method is more suitable for being used in places with complex sound environments, such as trains, subways and the like, with large motors; specifically, a preset structural sound database may be previously established and stored, from which subharmonic signals corresponding to high-frequency noise are acquired.
The construction process of the preset construction sound database comprises the following steps:
and collecting high-frequency noise in different acoustic environments as samples, and dividing the frequency band of the high-frequency noise.
And correspondingly obtaining noise signals of a plurality of frequency bands according to the noise spectrum characteristic information. The high-frequency noise is divided into frequency bands to save the workload when the subharmonic structure is performed. For example, high frequency noise, such as 3000-6000Hz, for example, sound of 600-1000Hz may be constructed to add to the high frequency noise.
Then selecting a noise signal of any frequency band, and carrying out frequency construction on the noise signal of the selected frequency band according to the musical acoustic or psychoacoustic principles to generate a plurality of subharmonic signals. For noise signals in any frequency band, the noise signals in the frequency band can be frequency-constructed according to the principle of musical acoustics or psychoacoustics by utilizing sound processing software (such as MATLAB) to generate a plurality of subharmonic signals.
Then, the noise signals of the selected frequency band are respectively synthesized with each subharmonic signal to generate a plurality of synthesized sound samples and output.
Wherein the frequency band to which the frequency of each synthesized sound sample belongs comprises the selected frequency band. For example, for a noise signal in the 4000-5000Hz frequency band, a low-frequency signal in the 400-500Hz frequency band is obtained after frequency construction, and the frequency of the synthesized sound sample obtained after the frequency construction can be 400-6000Hz, so that the 400-6000Hz frequency band comprises the 4000-5000Hz frequency band. Therefore, the frequency of the noise signal of the selected frequency band can be compensated through the subharmonic signal, namely, the frequency coverage range of the synthesized sound sample is wide.
And then, scoring each synthesized sound sample according to a preset evaluation method, and acquiring a constructed sound sample corresponding to the noise signal of the selected frequency band according to the scoring result of each synthesized sound sample.
The preset evaluation method may include: 1) Determining an evaluation person, wherein the evaluation person has normal hearing and can be a common worker, and the number of people can be more than 10; 2) Scoring criteria, such as, for example, a percentile score, may be used, along with five-level scoring criteria, such as, for example, a preference: very pleasant (e.g., sound comfortable, calm, pleasant) (80-100 minutes), good: pleasant (60-80 minutes), in: typically 40-60 minutes), difference: bad hearing (20-40 points), inferior: very difficult to hear (e.g., uncomfortable, annoying, restless, etc.) (0-20 points), i.e., the raters can score on a percent basis based on the rating; 3) Listening conditions, such as listening evaluation in a quieter indoor environment.
For example, an evaluator is composed of 10 adults, each of which can play each synthesized sound sample corresponding to a selected frequency band 3 times in a quieter indoor environment. After 3 times of playing, the 20 evaluators score, and after the scoring is completed, the scoring result is subjected to mathematical statistics to select a synthesized sound sample with the highest score (for example, the average score is the highest), and the constructed sound sample corresponding to the synthesized sound sample is used as the constructed sound sample corresponding to the noise signal of the selected frequency band. Similarly, a construction sound sample corresponding to the noise signal of each frequency band can be obtained, and the set of all the construction sound samples is the preset construction sound database.
The other is to generate a harmonic signal in real time, when the analysis and acquisition module 121 determines the target signal, the signal generating function directly acts on the signal generating module 122 (if the high frequency noise expression is set to y=sin (2×pi×a×f×t), the generating function of the subharmonic is y1=ma×sin (2×pi×na×f×t), the m value determines the sound pressure level of the subharmonic signal, and the n value determines the frequency of the generated subharmonic signal, so that only the determination point (m, n) is needed when generating the subharmonic. The cost of the method is relatively expensive, but the sound construction processing is fine and smooth, and the method is relatively suitable for places with relatively high requirements on sound quality such as family cars, meeting rooms and the like.
In later experiments and researches, we found that, while the subharmonic structure is performed, we add a sound signal with a frequency close to that of the target sound, for the sake of distinction, the subharmonic signal is called a sum sound signal, the sound signal with a frequency close to that of the sum sound signal is a masking signal, and after the masking signal is added, the subjective feeling is improved to a greater extent. Preferably, the sound masking signal is also generated according to the frequency of the high-frequency noise signal; the sound masking signal comprises a sound signal and a masking signal; the harmonic signal is the subharmonic signal, and the effect of the masking signal and the generation mechanism thereof are explained as follows: the masking signal is such that when a stronger sound conceals a weaker sound, the phenomenon that the weaker sound cannot be heard is referred to as a "masking effect". When listening to two or more sounds simultaneously, the auditory system produces a so-called "masking effect", i.e. each pure tone becomes more inaudible or inaudible, or the pure tones are partially or completely "masked", which is used to generate a "masking signal" for the high frequency noise, which "masking signal" renders the high frequency noise signal inaudible, the "masking signal" being of a lower frequency than the noise signal. In this way, on the one hand, the effect of masking the noise signal is achieved, and on the other hand, the sharpness is also slightly reduced, at least not increased. In this way, the masking signal is required to have a frequency lower than that of the high-frequency noise signal, and the sound pressure level of the masking signal is required to be consistent with the sound pressure level variation trend of the harmony signal. By trend of change is meant that it matches the trend of the sound pressure level of the sound signal, for example, the masking signal is also reduced relative to the pitch of the high frequency noise signal, assuming that the sound pressure level of the sound signal is linearly reduced as a whole, but it should be noted that the reduced amplitude thereof is not necessarily kept consistent with the reduced amplitude of the sound signal. If the sound pressure level of the sum sound signal is kept constant, the sound pressure level of the masking signal is also kept constant with respect to the sound pressure level of the high-frequency noise signal.
Preferably, as shown in fig. 4, a display 14 is also included for displaying parameters and/or processes in the process generator 12.
In order to further enable the person skilled in the art to understand the invention, a specific explanation of the portable exciter 1 of the inventive concept is provided below in connection with a specific mechanical schematic.
As shown in fig. 5 below, the portable actuator 1 in this example includes a housing 10; the processing generator 12 is a control circuit board 12a; the signal acquisition device 11 is a built-in microphone 11a, and the sound playing device 13 is a built-in loudspeaker 13a; the control circuit board 12a, the built-in microphone 11a, and the built-in speaker 13a are mounted in the housing 10. This preferred way integrates it into one device, which only needs to be placed in the vicinity of the noise source 2 when it is desired to optimise the high frequency noise environment. In the present embodiment, the housing 10 includes a lower case 101 and an upper cover 102, wherein the control circuit board 12a, the built-in microphone 11a and the built-in speaker 13a are installed in a space where the lower case 101 and the upper cover 102 are enclosed; in this example, the built-in microphone 11a and the built-in speaker 13a are generally mounted on the control circuit board 12a, but the casing 10 is provided with a microphone hole through which the sound of the built-in microphone 11a is transmitted and a sound hole through which the sound of the built-in speaker 13a is transmitted. Or the built-in microphone 11a is directly mounted on the housing 10, but is electrically connected to the control wiring board 12a; or a built-in speaker 13a may be mounted on the housing 10 to be electrically connected to the control wiring board 12a.
Alternatively, as shown in fig. 6 below, the portable actuator 1 in this example includes a housing 10, and the process generator 12 is a control wiring board 12a; the signal acquisition device 11 is an external microphone 11b, and the sound playing device 13 is an external loudspeaker 13b; the control circuit board 12a is installed in the housing 10; the external microphone 11b and the external speaker 13b are connected to the control circuit board 12a by wired or wireless means. In this way, the speaker and the microphone may be external, and made into a split type, and the external microphone 11b and the external speaker 13b are placed near the noise source 2 to sample the noise, and after being processed, the subharmonic signal is played through the external speaker 13 b.
As shown in fig. 5 and 6, the housing 10 is provided with a display 14, and the display 14 in this example is preferably an LCD display 14a. Meanwhile, the device also comprises an input device for inputting related parameters, configuring and the like.
The control circuit board 12a includes a central processing unit and several interface modules. The control circuit board 12a includes an algorithm integrator, a power amplifier, an a/D converter, and the like, and the algorithm integrator has two parts, namely, one part is used for calculating and identifying the sound pressure and the frequency of the environmental noise signal, and the other part is used for generating a target frequency signal and controlling the frequency sound pressure level to generate a harmonic signal. And the power amplifier is used for adjusting the power of the target signal to adapt to the power required by the sound signal. An a/D converter for converting the digital signal into an analog signal and outputting the analog signal to the audio playback device 13. In addition, other external ports are included, such as storage, communication, bluetooth, etc. modules.
The portable exciter 1 can be used in the vicinity of various noise sources 2 generating various high-frequency noise for noise reduction processing thereof. For example, in some portable exciters 1, the improvement of the acoustic quality is mainly aimed at the high-frequency noise-related sound similar to a motor, so that a corresponding high-frequency noise signal of the motor is available. For example, high-power transformers can emit high-frequency noise, and subjective feeling of the noise is very bad, in the scene, a subharmonic exciter is used, and a spherical sound source (the noise source 2 is the spherical sound source) is selected as a playing module.
The portable exciter 1 provided by the invention collects noise (mainly high-frequency noise) in an acoustic environment through the signal collecting device 11, generates subharmonic signals of the high-frequency noise according to the high-frequency noise in the acoustic environment, and plays the subharmonic signals through the sound playing device 13 to form fusion and sound 3 (harmony interval) so as to improve the acoustic quality of the environment. According to the portable exciter 1 provided by the invention, the specific form of the noise source 2 is not needed to be considered, the portable exciter 1 can be placed near the noise source 2 as long as the noise source 2 emits high-frequency noise, subharmonic signals are constructed by utilizing the relevant knowledge of music acoustics, sound signals in the environment are modified according to the psychoacoustic characteristics of people, fusion and sound 3 are formed to optimize the high-frequency noise, the tone quality, tone quality and sharpness of sound can be improved, and the sound quality of the sound environment is improved. The portable exciter 1 is easy to implement, simple to operate, no longer depends on other products as a parent body, is not limited by the environment, and can be placed in an acoustic environment where noise cancellation is required.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A portable exciter, which is characterized by comprising a signal acquisition device, a processing generator and a sound playing device;
the signal acquisition device is used for acquiring noise in an acoustic environment;
the processing generator comprises an analysis acquisition module and a signal generation module, wherein the analysis acquisition module is used for acquiring the noise, analyzing the frequency and the sound pressure level of the noise and acquiring the subharmonic composition required to be generated;
the signal generation module is used for generating subharmonic signals according to subharmonic components required to be generated, adding a masking signal to the subharmonic signals while generating the subharmonic signals, wherein the masking signal is generated according to the frequency of high-frequency noise, the frequency of the masking signal is smaller than that of the high-frequency noise, the sound pressure level of the masking signal is consistent with the change trend of the sound pressure level of the subharmonic signals, and the masking signal is used for making the high-frequency noise inaudible;
the sound playing device is used for inputting the subharmonic signals and playing the subharmonic signals which can be fused with noise in the sound environment to form fused harmony noise reduction construction sound.
2. The portable actuator of claim 1, further comprising a display for displaying parameters and/or processes in the process generator.
3. The portable actuator of claim 1, comprising a housing; the processing generator is a control circuit board; the signal acquisition device is a built-in microphone, and the sound playing device is a built-in loudspeaker; the control circuit board, the built-in microphone and the built-in speaker are installed in the shell.
4. The portable actuator of claim 1, comprising a housing, the process generator being a control circuit board; the signal acquisition device is an external microphone, and the sound playing device is an external loudspeaker; the control circuit board is arranged in the shell; the external microphone and the external loudspeaker are connected with the control circuit board in a wired or wireless mode.
5. The portable actuator according to claim 3 or 4, wherein said housing has an LCD display mounted thereon.
6. The portable exciter according to claim 3 or 4, wherein the control wiring board comprises a central processing unit and a plurality of interface modules.
7. The portable actuator of claim 1, further comprising a memory having stored therein respective preset subharmonic signals corresponding to noise frequencies.
8. The portable exciter of claim 1, wherein said processing generator is operative to invoke a subharmonic generation function by which the component harmonic signals are generated in real time.
9. The portable exciter of claim 1, wherein said processing generator further comprises means for generating a low frequency construction signal of equal amplitude in anti-phase with the low frequency noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811278476.6A CN111128208B (en) | 2018-10-30 | 2018-10-30 | Portable exciter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811278476.6A CN111128208B (en) | 2018-10-30 | 2018-10-30 | Portable exciter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111128208A CN111128208A (en) | 2020-05-08 |
| CN111128208B true CN111128208B (en) | 2023-09-05 |
Family
ID=70484613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811278476.6A Active CN111128208B (en) | 2018-10-30 | 2018-10-30 | Portable exciter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111128208B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112509592B (en) * | 2020-11-18 | 2024-01-30 | 广东美的白色家电技术创新中心有限公司 | Electrical apparatus, noise processing method, and readable storage medium |
| CN113096630A (en) * | 2021-03-11 | 2021-07-09 | 电子科技大学 | Wireless active noise control system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354885A (en) * | 2007-01-16 | 2009-01-28 | 哈曼贝克自动系统股份有限公司 | Active noise control system |
| KR20100048558A (en) * | 2008-10-31 | 2010-05-11 | 삼성전자주식회사 | Restoraton apparatus and method for voice |
| CN103625395A (en) * | 2013-12-05 | 2014-03-12 | 合肥工业大学 | System for improving in-vehicle moving sound sensing quality of electric vehicle |
| CN106933146A (en) * | 2017-03-14 | 2017-07-07 | 吉林大学 | Electrocar pedestrian's caution sound method for designing, caution sound control system and method |
| CN108574912A (en) * | 2017-03-10 | 2018-09-25 | 比亚迪股份有限公司 | New energy vehicle and method, the system for improving new energy in-vehicle sound quality |
| CN108694935A (en) * | 2017-04-07 | 2018-10-23 | 比亚迪股份有限公司 | New energy vehicle and its active denoising method, system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9927131D0 (en) * | 1999-11-16 | 2000-01-12 | Royal College Of Art | Apparatus for acoustically improving an environment and related method |
| US20130275126A1 (en) * | 2011-10-11 | 2013-10-17 | Robert Schiff Lee | Methods and systems to modify a speech signal while preserving aural distinctions between speech sounds |
| US10304473B2 (en) * | 2017-03-15 | 2019-05-28 | Guardian Glass, LLC | Speech privacy system and/or associated method |
-
2018
- 2018-10-30 CN CN201811278476.6A patent/CN111128208B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354885A (en) * | 2007-01-16 | 2009-01-28 | 哈曼贝克自动系统股份有限公司 | Active noise control system |
| KR20100048558A (en) * | 2008-10-31 | 2010-05-11 | 삼성전자주식회사 | Restoraton apparatus and method for voice |
| CN103625395A (en) * | 2013-12-05 | 2014-03-12 | 合肥工业大学 | System for improving in-vehicle moving sound sensing quality of electric vehicle |
| CN108574912A (en) * | 2017-03-10 | 2018-09-25 | 比亚迪股份有限公司 | New energy vehicle and method, the system for improving new energy in-vehicle sound quality |
| CN106933146A (en) * | 2017-03-14 | 2017-07-07 | 吉林大学 | Electrocar pedestrian's caution sound method for designing, caution sound control system and method |
| CN108694935A (en) * | 2017-04-07 | 2018-10-23 | 比亚迪股份有限公司 | New energy vehicle and its active denoising method, system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111128208A (en) | 2020-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109300465B (en) | New energy vehicle and active noise reduction method and system thereof | |
| Rådsten Ekman et al. | Similarity and pleasantness assessments of water-fountain sounds recorded in urban public spaces | |
| CN111081213B (en) | New energy vehicle, active sound system thereof and active sound control method | |
| JP2009510534A (en) | System for reducing the perception of audible noise for human users | |
| Merchel et al. | The influence of vibrations on musical experience | |
| US11087734B1 (en) | Active noise reduction method, system, and new energy vehicle | |
| CN111128208B (en) | Portable exciter | |
| Rämö et al. | Perceptual frequency response simulator for music in noisy environments | |
| WO2021111965A1 (en) | Sound field generation system, sound processing apparatus, and sound processing method | |
| Stark | Live sound reinforcement: A comprehensive guide to PA and music reinforcement systems and technology | |
| CN108574912B (en) | New energy vehicle and method, the system for improving new energy in-vehicle sound quality | |
| Fuchs et al. | Requirements for low-frequency reverberation in spaces for music: Part 2: Auditoria for performances and recordings. | |
| Coker et al. | A survey on virtual bass enhancement for active noise cancelling headphones | |
| Grazioli et al. | Preliminary evaluation of a sound system employing a cancelling auralizer for producing virtual rooms in a modern recording studio | |
| Jers | The impact of location on the singing voice | |
| JP4867542B2 (en) | Masking device | |
| Brereton et al. | The Virtual Singing Studio: A loudspeaker-based room acoustics simulation for real-time musical performance | |
| KR20200093576A (en) | In a helmet, a method of performing live public broadcasting in consideration of the listener's auditory perception characteristics | |
| Peled et al. | Study of speech intelligibility in noisy enclosures using spherical microphones arrays | |
| Dionela et al. | ANCoustics: A Systematic Analysis in Acoustics with Active Noise-Cancellation Technology | |
| Lin et al. | Improving speech intelligibility in classrooms by decreasing sound energy of low frequency | |
| Bozzoli | Sound, noise and acoustics | |
| RU2284584C1 (en) | Method for transferring acoustic signal to user and device for realization of said method | |
| Cardinell et al. | Guide to industrial sound | |
| Ahnert et al. | Room Acoustics and Sound System Design |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |